package http;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import javax.net.ssl.SSLContext;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpException;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.config.ConnectionConfig;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.config.SocketConfig;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.conn.socket.LayeredConnectionSocketFactory;
import org.apache.http.conn.socket.PlainConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.conn.ssl.TrustStrategy;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.entity.mime.FormBodyPart;
import org.apache.http.entity.mime.HttpMultipartMode;
import org.apache.http.entity.mime.MultipartEntityBuilder;
import org.apache.http.impl.client.BasicCookieStore;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.impl.cookie.BasicClientCookie;
import org.apache.http.impl.cookie.BestMatchSpec;
import org.apache.http.message.BasicNameValuePair;


class AnyTrustStrategy implements TrustStrategy{
    
    @Override
    public boolean isTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        return true;
    }
    
}

public class HttpUtil {

    private static final Log log= LogFactory.getLog(HttpUtil.class);

    private static int bufferSize= 1024;

    private static volatile HttpUtil instance;
    
    private ConnectionConfig connConfig;

    private SocketConfig socketConfig;

    private ConnectionSocketFactory plainSF;

    private KeyStore trustStore;

    private SSLContext sslContext;

    private LayeredConnectionSocketFactory sslSF;

    private Registry<ConnectionSocketFactory> registry;

    private PoolingHttpClientConnectionManager connManager;

    private volatile HttpClient client;

    private volatile BasicCookieStore cookieStore;

    public static String defaultEncoding= "utf-8";

    private static List<NameValuePair> paramsConverter(Map<String, String> params){
        List<NameValuePair> nvps = new LinkedList<NameValuePair>();
        Set<Entry<String, String>> paramsSet= params.entrySet();
        for (Entry<String, String> paramEntry : paramsSet) {
            nvps.add(new BasicNameValuePair(paramEntry.getKey(), paramEntry.getValue()));
        }
        return nvps;
    }

    public static String readStream(InputStream in, String encoding){
        if (in == null){
            return null;
        }
        try {
            InputStreamReader inReader= null;
            if (encoding == null){
                inReader= new InputStreamReader(in, defaultEncoding);
            }else{
                inReader= new InputStreamReader(in, encoding);
            }
            char[] buffer= new char[bufferSize];
            int readLen= 0;
            StringBuffer sb= new StringBuffer();
            while((readLen= inReader.read(buffer))!=-1){
                sb.append(buffer, 0, readLen);
            }
            inReader.close();
            return sb.toString();
        } catch (IOException e) {
            log.error("读取返回内容出错", e);
        }
        return null;
    }

    private HttpUtil(){
        //设置连接参数
        connConfig = ConnectionConfig.custom().setCharset(Charset.forName(defaultEncoding)).build();
        socketConfig = SocketConfig.custom().setSoTimeout(100000).build();
        RegistryBuilder<ConnectionSocketFactory> registryBuilder = RegistryBuilder.<ConnectionSocketFactory>create();
        plainSF = new PlainConnectionSocketFactory();
        registryBuilder.register("http", plainSF);
        //指定信任密钥存储对象和连接套接字工厂
        try {
            trustStore = KeyStore.getInstance(KeyStore.getDefaultType());
//            sslContext = SSLContexts.custom().useTLS().loadTrustMaterial(trustStore, new AnyTrustStrategy()).build();
            sslContext = SSLContexts.custom().useSSL().loadTrustMaterial(trustStore, new AnyTrustStrategy()).build();
            sslSF = new SSLConnectionSocketFactory(sslContext, SSLConnectionSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
            registryBuilder.register("https", sslSF);
        } catch (KeyStoreException e) {
            throw new RuntimeException(e);
        } catch (KeyManagementException e) {
            throw new RuntimeException(e);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
        registry = registryBuilder.build();
        //设置连接管理器
        connManager = new PoolingHttpClientConnectionManager(registry);
        connManager.setDefaultConnectionConfig(connConfig);
        connManager.setDefaultSocketConfig(socketConfig);
        //指定cookie存储对象
        cookieStore = new BasicCookieStore();
        //构建客户端
        client= HttpClientBuilder.create().setDefaultCookieStore(cookieStore).setConnectionManager(connManager).build();
    }

    public static HttpUtil getInstance(){
        synchronized (HttpUtil.class) {
            if (HttpUtil.instance == null){
                instance = new HttpUtil();
            }
            return instance;
        }
    }

    public InputStream doGet(String url) throws URISyntaxException, ClientProtocolException, IOException{
        HttpResponse response= this.doGet(url, null);
        return response!=null ? response.getEntity().getContent() : null;
    }

    public String doGetForString(String url) throws URISyntaxException, ClientProtocolException, IOException{
        return HttpUtil.readStream(this.doGet(url), null);
    }

    public InputStream doGetForStream(String url, Map<String, String> queryParams) throws URISyntaxException, ClientProtocolException, IOException{
        HttpResponse response= this.doGet(url, queryParams);
        return response!=null ? response.getEntity().getContent() : null;
    }

    public String doGetForString(String url, Map<String, String> queryParams) throws URISyntaxException, ClientProtocolException, IOException{
        return HttpUtil.readStream(this.doGetForStream(url, queryParams), null);
    }

    /**
     * 基本的Get请求
     * @param url 请求url
     * @param queryParams 请求头的查询参数
     * @return
     * @throws URISyntaxException 
     * @throws IOException 
     * @throws ClientProtocolException 
     */
    public HttpResponse doGet(String url, Map<String, String> queryParams) throws URISyntaxException, ClientProtocolException, IOException{
        HttpGet gm = new HttpGet();
        URIBuilder builder = new URIBuilder(url);
        //填入查询参数
        if (queryParams!=null && !queryParams.isEmpty()){
            builder.setParameters(HttpUtil.paramsConverter(queryParams));
        }
        gm.setURI(builder.build());
        return client.execute(gm);
    }

    public InputStream doPostForStream(String url, Map<String, String> queryParams) throws URISyntaxException, ClientProtocolException, IOException {
        HttpResponse response = this.doPost(url, queryParams, null);
        return response!=null ? response.getEntity().getContent() : null;
    }

    public String doPostForString(String url, Map<String, String> queryParams) throws URISyntaxException, ClientProtocolException, IOException {
        return HttpUtil.readStream(this.doPostForStream(url, queryParams), null);
    }

    public InputStream doPostForStream(String url, Map<String, String> queryParams, Map<String, String> formParams) throws URISyntaxException, ClientProtocolException, IOException{
        HttpResponse response = this.doPost(url, queryParams, formParams);
        return response!=null ? response.getEntity().getContent() : null;
    }

    public String doPostRetString(String url, Map<String, String> queryParams, Map<String, String> formParams) throws URISyntaxException, ClientProtocolException, IOException{
        return HttpUtil.readStream(this.doPostForStream(url, queryParams, formParams), null);
    }

    /**
     * 基本的Post请求
     * @param url 请求url
     * @param queryParams 请求头的查询参数
     * @param formParams post表单的参数
     * @return
     * @throws URISyntaxException 
     * @throws IOException 
     * @throws ClientProtocolException 
     */
    public HttpResponse doPost(String url, Map<String, String> queryParams, Map<String, String> formParams) throws URISyntaxException, ClientProtocolException, IOException{
        HttpPost pm = new HttpPost();
        URIBuilder builder = new URIBuilder(url);
        //填入查询参数
        if (queryParams!=null && !queryParams.isEmpty()){
            builder.setParameters(HttpUtil.paramsConverter(queryParams));
        }
        pm.setURI(builder.build());
        //填入表单参数
        if (formParams!=null && !formParams.isEmpty()){
            pm.setEntity(new UrlEncodedFormEntity(HttpUtil.paramsConverter(formParams)));
        }
        return client.execute(pm);
    }

    /**
     * 多块Post请求
     * @param url 请求url
     * @param queryParams 请求头的查询参数
     * @param formParts post表单的参数,支持字符串-文件(FilePart)和字符串-字符串(StringPart)形式的参数
     * @param maxCount 最多尝试请求的次数
     * @return
     * @throws URISyntaxException 
     * @throws ClientProtocolException 
     * @throws HttpException
     * @throws IOException
     */
    public HttpResponse multipartPost(String url, Map<String, String> queryParams, List<FormBodyPart> formParts) throws URISyntaxException, ClientProtocolException, IOException{
        HttpPost pm= new HttpPost();
        URIBuilder builder = new URIBuilder(url);
        //填入查询参数
        if (queryParams!=null && !queryParams.isEmpty()){
            builder.setParameters(HttpUtil.paramsConverter(queryParams));
        }
        pm.setURI(builder.build());
        //填入表单参数
        if (formParts!=null && !formParts.isEmpty()){
            MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
            entityBuilder = entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            for (FormBodyPart formPart : formParts) {
                entityBuilder = entityBuilder.addPart(formPart.getName(), formPart.getBody());
            }
            pm.setEntity(entityBuilder.build());
        }
        return client.execute(pm);
    }

    /**
     * 获取当前Http客户端状态中的Cookie
     * @param domain 作用域
     * @param port 端口 传null 默认80
     * @param path Cookie路径 传null 默认"/"
     * @param useSecure Cookie是否采用安全机制 传null 默认false
     * @return
     */
    public Map<String, Cookie> getCookie(String domain, Integer port, String path, Boolean useSecure){
        if (domain == null){
            return null;
        }
        if (port==null){
            port= 80;
        }
        if (path==null){
            path="/";
        }
        if (useSecure==null){
            useSecure= false;
        }
        List<Cookie> cookies = cookieStore.getCookies();
        if (cookies==null || cookies.isEmpty()){
            return null;
        }

        CookieOrigin origin= new CookieOrigin(domain, port, path, useSecure);
        BestMatchSpec cookieSpec = new BestMatchSpec();
        Map<String, Cookie> retVal= new HashMap<String, Cookie>();
        for (Cookie cookie : cookies) {
            if(cookieSpec.match(cookie, origin)){
                retVal.put(cookie.getName(), cookie);               
            }
        }
        return retVal;
    }

    /**
     * 批量设置Cookie
     * @param cookies cookie键值对图
     * @param domain 作用域 不可为空
     * @param path 路径 传null默认为"/"
     * @param useSecure 是否使用安全机制 传null 默认为false
     * @return 是否成功设置cookie
     */
    public boolean setCookie(Map<String, String> cookies, String domain, String path, Boolean useSecure){
        synchronized (cookieStore) {
            if (domain==null){
                return false;
            }
            if (path==null){
                path= "/";
            }
            if (useSecure==null){
                useSecure= false;
            }
            if (cookies==null || cookies.isEmpty()){
                return true;
            }
            Set<Entry<String, String>> set= cookies.entrySet();
            String key= null;
            String value= null;
            for (Entry<String, String> entry : set) {
                key= entry.getKey();
                if (key==null || key.isEmpty() || value==null || value.isEmpty()){
                    throw new IllegalArgumentException("cookies key and value both can not be empty");
                }
                BasicClientCookie cookie= new BasicClientCookie(key, value);
                cookie.setDomain(domain);
                cookie.setPath(path);
                cookie.setSecure(useSecure);
                cookieStore.addCookie(cookie);
            }
            return true;
        }
    }

    /**
     * 设置单个Cookie
     * @param key Cookie键
     * @param value Cookie值
     * @param domain 作用域 不可为空
     * @param path 路径 传null默认为"/"
     * @param useSecure 是否使用安全机制 传null 默认为false
     * @return 是否成功设置cookie
     */
    public boolean setCookie(String key, String value, String domain, String path, Boolean useSecure){
        Map<String, String> cookies= new HashMap<String, String>();
        cookies.put(key, value);
        return setCookie(cookies, domain, path, useSecure);
    }
    
    public static void main(String[] args) {
        HttpUtil httpUtil = getInstance() ;
        try {
            InputStream is = httpUtil.doGetForStream("https://kyfw.12306.cn/otn", null) ;
            String result = readStream(is, "UTF-8") ;
            System.out.println(result) ;
            InputStream is2 = httpUtil.doGetForStream("https://www.baidu.com", null) ;
            String result2 = readStream(is2, "UTF-8") ;
            System.out.println(result2) ;
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (URISyntaxException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
//        Map<String, String> params = new HashMap<String, String>() ;
//        params.put("appId", "") ;
//        params.put("appKey", "") ;
//        params.put("emails", "") ;
//        httpUtil.doPostForStream("https://openapi.quanshi.com/user/account/getUserIdsByEmails", params) ;
    }
}
